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Canon SPEEDLIGHT 420ex Instructions Manual page 33

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Flash in Full Auto Mode
Fill Flash
Even in daylight, you can use flash as fill light to soften harsh shadows or
illuminate a dark, backlit sUbject.
III
With fill flash, the subject illuminated with flash might look unnatural compared to
the background's brightness. To prevent this, the flash output is reduced
automatically to obtain a more natural balance between the subject and
background brightness. This is called automatic flash output reduction.
33

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